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Finding the Fourth Proportional to 20,751, 28,636.38 and 11,319.60

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Solution

The fourth proportional to 20,751, 28,636.38 and 11,319.60 is: 15,621.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,751 : 28,636.38 = 11,319.60 : x
  2. Step 2: Convert to fraction form
    20,751/28,636.38 = 11,319.60/x
  3. Step 3: Cross multiply
    20,751x = 28,636.38 × 11,319.60
  4. Step 4: Simplify right side
    20,751x = 324,152,367.05
  5. Step 5: Solve for x
    x = 324,152,367.05/20,751
  6. Step 6: Final answer
    x = 15,621.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.